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Method for a fan to resist high backpressure

Publishing Venue

Abstract

Disclosed is a method for a fan to resist high backpressure. Benefits include improved performance and improved reliability.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
67% of the total text.

Method for a fan to resist high backpressure

Disclosed is a method for a fan to resist high backpressure.
Benefits include improved performance and improved reliability.

Background

� � � � � Conventional fan
designs have a gap between the fan blade tip and the external frame (see
Figure 1). The gap could enable the air to backflow, especially where high
backpressure exists (see Figure 2). The gap could reduce the fan’s
capability, resulting in lower airflow. The conventional solution to this
problem is to increase the revolutions per minute (RPMs) so that the airflow
loss through the gap between the fan blade tip and the fan frame can be offset
by the higher airflow rate through the fan blade area.

General description

� � � � � The disclosed method
is a fan design that can resist higher backpressure. The frame design reduces
the typical gap between the fan blade tip and the frame. This method increases
the path for the back-flow air so that the backflow can be minimized.

� � � � � The key element is a frame for the fan
blade and a matching external frame.

Advantages�

� � � � � The disclosed method provides advantages, including:

·
Improved fan capability to resist high backpressure

·
Improved fan blade area so that a higher airflow rate
is delivered

·
Improved reliability due to the blade supporting
structure so that blade breakage is significantly reduced

Detailed description

� � � � � The disclosed method
includes a frame that is added to the fan blade (see Figure 3)....